An Aerial Radiological Measuring Survey (ARMS) of the Camden-Delaware Valley area was made for the Civil Effects Test Operations, Division of Biology and Medicine, U. S. Atomic Energy Commission, by Edgerton, Cermeshausen & Grier, Inc., between Sept. 4 and Oct. 16, 1961. The survey was part of a nationwide program to measure present environmental levels of gamma radiation. Approximately 6000 traverse miles were flown, at an altitude of 500 ft above the ground, in the area which consists of a 50-mile square centered on Camden, N. J., the part of New Jersey south of this square, and a strip about 15 miles wide southwest of Delaware Bay. The EG&G ARMS-II instrumentation was used in the survey. The data are presented in aeroradioactivity units, or areas with similar gamma radiation rates at 500 ft, at two map scales: (1) generalized at about 1:1,000,000 and (2) detailed at 1: 250,000. The aeroradioactivity in the area is less than 800 counts/sec except for four small areas in the northwest part of the area where it is less than 1200 counts/sec. In most of the New Jersey and Delaware parts of the area, the radioactivity is less than 400 counts/sec. Aerial measurements of ground radioactivity in the ARMS-II Camden-Delaware Valley area were everywhere consistent with what was expected, considering the geology of the area. The south part of the area has a low radioactivity, and the surficial materials are mostly sands and gravels, which are commonly weakly radioactive. The north part of the area is slightly more radioactive, which would be expected from the types of sedimentary, igneous, and meta- morphic rocks exposed there. Artificial radionuclides are probably present in only small quantities because the maximum background gamma radioactivity in many places is less than 200 counts/sec.